warmth vs tepidness

warmth and tepidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
warmth	Yes	No	No	No
tepidness	Yes	No	No	No

As nouns, tepidness is a hyponym of warmth; that is, tepidness is a word with a more specific, narrower meaning than warmth:

Other hyponyms of warmth include lukewarmness, tepidity.

warmth (noun)	tepidness (noun)
a quality proceeding from feelings of affection or love	a warmness resembling the temperature of the skin
the quality of having a moderate degree of heat	lack of passion, force or animation
the trait of being intensely emotional
the sensation caused by heat energy
a warmhearted feeling